greatly

　　reduce

　　the effectiveness of bees’ immune systems，making them easier to suffer from diseases.

　　Observing the death of honeybees should warn us that our own well­being

　　might

　　be

　　similarly

　　threatened，and

　　the widespread collapse of so many groups presents a clear message.We must demand that our regulatory authorities require studies on how exposure to low dosages of combined chemicals

　　may

　　affect

　　human

　　health

　　before

　　approving compounds.

　　中华资源库 ziyuanku.comBees also provide some clues to how we may build a more collaborative relationship with the services that ecosystems can provide.Bees could offer some of the pollination services needed for agriculture.People discover that crop harvests，and thus

　　profits，are

　　maximized

　　if some

　　croplands

　　are

　　left uncultivated for bees.Meanwhile a variety of wild plants means a healthier，more diverse bee population，which will then move to the planted fields next door in larger and more active numbers.

　　1．Which of the following is NOT the cause that leads to bees’

　　death?

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